I didn't mean it as a criticism of you -- I meant more that I was shocked that people in the comments disagreed with your argument. I mean, no matter how you form your moral values, they're going to be affected by factual claims, and people will change their opinions on moral issues based on learning new objective facts. Actually, that's probably the predominant way that people change their minds on moral issues.

"X is good."

"What's that? You say X kills vast numbers of people? You have strong evidence for that? Oops, X is bad."